class_docstr: An AddressList encapsulates a list of parsed RFC 2822 addresses.
code: def __add__(self, other):
      # Set union
      newaddr = AddressList(None)
      newaddr.addresslist = self.addresslist[:]
      for x in other.addresslist:
          if not x in self.addresslist:
              newaddr.addresslist.append(x)
      return newaddr
  
imports: import time, calendar
label_desc: Use image node_id 3 for calling the AddressList obj's underlying member method code with example usage: obj.__add__(other) and returns: newaddr